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Try a short busy-wait in acpiec_wait before falling back to tsleep

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This greatly speeds up SMBus reading in acpisbs making its periodic
acpisbs_read execution go from ~6 seconds to 125 milliseconds,
preventing backlog in the ACPI task queue.

ok kettenis
This commit is contained in:
jcs
2025-11-11 19:29:06 +00:00
parent f90c654102
commit a2c0ce816e
1 changed files with 4 additions and 3 deletions
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7
sys/dev/acpi/acpiec.c
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@@ -1,4 +1,4 @@
/* $OpenBSD: acpiec.c,v 1.66 2024/06/25 11:57:10 kettenis Exp $ */
/* $OpenBSD: acpiec.c,v 1.67 2025/11/11 19:29:06 jcs Exp $ */
/*
* Copyright (c) 2006 Can Erkin Acar <canacar@openbsd.org>
*
@@ -91,7 +91,8 @@ void
acpiec_wait(struct acpiec_softc *sc, uint8_t mask, uint8_t val)
{
static int acpiecnowait;
uint8_t stat;
int tries = 0;
uint8_t stat;
dnprintf(40, "%s: EC wait_ns for: %b == %02x\n",
DEVNAME(sc), (int)mask,
@@ -100,7 +101,7 @@ acpiec_wait(struct acpiec_softc *sc, uint8_t mask, uint8_t val)
while (((stat = acpiec_status(sc)) & mask) != val) {
if (stat & EC_STAT_SCI_EVT)
sc->sc_gotsci = 1;
if (cold || (stat & EC_STAT_BURST))
if (cold || (stat & EC_STAT_BURST) || tries++ < 300)
delay(1);
else
tsleep(&acpiecnowait, PWAIT, "acpiec", 1);